Experts believe the whales are on a sandbar on the banks of Macquarie Heads, a protected forest area, the Tasmanian regional government said.
It is not the first time that a group of whales has been stranded on Australian beaches for reasons unknown to experts.
In previous incidents, the scientific community considered the possibility of whales reaching the shore attracted by the sonar of large ships or guided by a group leader disoriented due to illness.
Some experts believe that they are social animals and if one of them makes a mistake and enters shallow water it is followed by the others.
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